Like the recent strip, which sold for $203,150 (Â£129,870) in November, the new piece was part of a selection of artwork swapped between Calvin and Hobbes's Bill Watterson and Adam@Home creator Brian Basset.

The strip is being sold by Basset's ex-wife Linda, The Daily Cartoonist reports. It is signed to the pair from Watterson.

"We know you've heard us say this before, but consider this a rare opportunity that may not be repeated for a long time to come," said Heritage.

"We have no more Watterson Calvin originals 'waiting in the wings' to trot out next time around."